This is strangely similar to the APRS standard, just using part 15 devices, instead of part 95

Posted at 2:46 pm on Sep 5th, 2009 by Chris KC8UFV

Hmm it doesn’t show the interface to see the map, which is pretty disappointing…

Posted at 3:01 pm on Sep 5th, 2009 by Jack

getting these the cost of an led throwie would be amazing. just quietly throw one into people backpack pockets or shoes…

Posted at 3:06 pm on Sep 5th, 2009 by Hiroe

Or, If it was able to use bluetooth to receive signals, and there was an app for cell phones that could send telemetry via BT to the controller. then that would be cool.

Posted at 3:11 pm on Sep 5th, 2009 by Jack

Isn’t this what we call a “wireless sensor network”, it just has some high power requirements due to the GPS…

Posted at 3:27 pm on Sep 5th, 2009 by Joel Haasnoot

What about doing it the other way?

Setting up three receivers and radio power meters in some three points and then triangulating the signals?

Posted at 4:03 pm on Sep 5th, 2009 by Gonzalo

Or doing it the swarm way where they all have synchronized internal clocks and directional antennas and can calculate relative locations.

Posted at 4:18 pm on Sep 5th, 2009 by Jack

imagine if you could tap into stuff that’s already constantly pinging gps in a network.

gm’s onstar cars? instantly know traffic conditions without having access to dot radar stations. blackberrys? easily find concentrations of business travelers. iphones? now you know where to advertise the farmer’s market. etc.

Posted at 4:56 pm on Sep 5th, 2009 by s0crates82

It would be illegal however to do this, im pretty sure. I think cellular radio communications are protected by the FCC, I know they are at least with scanners and voice traffic…. I don’t know about data over a cellular transmission.

Posted at 6:05 pm on Sep 5th, 2009 by Jack

You can’t interfere with the signals and jam them or anything, but the air is still free and the electromagnetic waves traveling through you or your property can be freely absorbed and any information disseminated is public domain. It’s no different than if I was shouting out my window to my neighbor, just over the electromagnetic spectrum.

Now if you broadcast on an ‘unauthorized’ bandwidth or subsequently jam any ‘legal’ signals then they get pissed and ‘fine’ you ‘a million dollarz’ or something, but I’m pretty sure that his exact frequency, although in the block allocated for digital transmission, most likely resides in one of the many white space gaps inbetween channels, being as how it’s quite a specific frequency.

Just speculation however…

Posted at 10:41 pm on Sep 5th, 2009 by xrazorwirex

Can you add the initiation words of the Harry Potter version to it?

Posted at 10:46 pm on Sep 5th, 2009 by Roee

@s0crates82 There are “intelligent” traffic systems that are being experimented with by the NY State DOT that do exactly what you suggested.

Posted at 6:31 am on Sep 6th, 2009 by Jeff

@xrazorwirex took a quick picture off the back of my radio scanner… heres a link http://tinypic.com/r/2mo36ys/3

Posted at 12:54 pm on Sep 6th, 2009 by Jack

Ok; I read up on the ‘laws’ (aka: whatever the FCC decides it wants to enforce) and apparently it’s also “Illegal to monitor remote radio-TV broadcast signals”… so.. your television is illegal… or maybe it’s illegal to make a television that doesn’t have an FCC stamp on it.. I’m not sure, probably whatever’s more convenient for them..

So ok, you may be violating an FCC law, but are you ‘really’ committing a crime that’s going to be enforced? And if you aren’t broadcasting on a registered spectrum or anything then it’s pretty tough to get caught since you aren’t interfering with anybodies stuff.

Posted at 4:46 pm on Sep 6th, 2009 by xrazorwirex

I looked into it more and to actually go through and monitor cellphone information (it’s encrypted) is a pain in the ass anyways – but alot of cellphones use standard gps I think, and I know you won’t have jackboots on your doorstep if you’re just trying to interface with gps satellites, so… figure it out – mabye use the cellphone’s internet connection to transmit its gps data to a server somewhere…

way too much thought is going into this….

Posted at 4:52 pm on Sep 6th, 2009 by xrazorwirex

Usually cellphones don’t constantly broadcast gps data. Unless they have been stolen, or the owner just loves to drain their battery. Lol.

Posted at 11:31 pm on Sep 6th, 2009 by Jack

Everybody remembers http://www.openbeacon.org/ .
Not to downplay the current project, but open-beacon seems a bit more like a marauders map to me.

Posted at 7:32 pm on Sep 7th, 2009 by FriedPope

I did this project for the 2009 Maker Faire for the National Association for Amateur Radio (“ARRL”) booth.

Thanks for all the comments, especially the first one comparing the project to APRS.

My idea was to show how to combine parts and techniques from the MAKE/DIY world with the ham radio world. There’s a significant overlap, both in interests and in individuals, and I felt that a project bringing something from each together would help cross the bridge in both directions.

I didn’t see it mentioned in the write-up, but there are some Youtube videos of both the MM project and some APRS projects at the Maker Faire:

For Part 1 (the Marauders) see
http://www.youtube.com/watch?v=S_Q69eQ_OK0
For Part 2 (the Map) see
http://www.youtube.com/watch?v=b4k5nBmsoM8

If you’re interested in doing something like this, but with more range, consider getting a ham radio license and trying out APRS.

Posted at 9:30 pm on Sep 8th, 2009 by Leigh

@Jack Ironic that I could listen to analog cellular communications with my UHF television receiver (without modification) in the 80s.

Posted at 10:27 pm on Sep 8th, 2009 by shicks